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Subject: RE: [soa-rm-ra] Strawman of outstanding issues


This is a good deck.

A couple of comments:




? is a registry a good example? Do we have better ones? Is it more than mediator?

I do not consider a registry to be a mediator. A registry is a specialized entity in his own right with its own set of goals.

Typically a mediator is an entity that is invoking service on behalf as a consumer and is seen by consumer as a service (compare to proxy in a distributed system). The difference between mediator and a simple proxy is significant – mediator is more like an interpreter in a conversation between people speaking different languages. Typical mediators do the following – transport transformation (for example MOM to HTTP), semantic alignment (data transformation), dynamic routing, often leveraging registry (version-based routing, etc)


I am not sure how Skill is relevant for SOA


I have a real issue with introducing resources into SOA. The problem is Resources are orthogonal to services – it is a completely different model of the world – see REST vs SOA. A service implementation internally does depend on resources, but this is opaque to the service consumer.

The issue here is that SOA is based on the functional decomposition, where functions can cross resource boundaries, where Resource decomposition is based on identifying resources, regardless of services they provide. A system can be build either way, but those will be 2 different systems. The relationship is similar to entity beans (resource) vs session beans (services).


Semantics is a really hard one. The issue is that in SOA semantics is defined by service provider. It is NOT specific to a consumer/provider pair. A service consumer can have his own semantics, but he typically has to use a mediator for resolving semantic differences



From: Peter F Brown [mailto:peter@peterfbrown.com]
Sent: Tuesday, December 07, 2010 8:09 PM
To: soa-rm-ra@lists.oasis-open.org
Subject: [soa-rm-ra] Strawman of outstanding issues



We have worked through the entirety of outstanding issues, questions and concerns for section 3 (along the way, examining also sections 1 & 2). We have, inevitably many, many, edits to propose!


However, and as promised on last week’s call, we now present a “Strawman”, in the form of the attached slide deck which we think touches on all the main issues and provides a narrative for addressing them.


We stress this is not an editing exercise but an attempt to gain consensus on the main issues, definitions and relationships between terms before the proceeding with presenting detailed dispositions of textual changes, in line with said consensus.


As previously announced, I will not be able to join the call tomorrow as I’ll be some 30,000 feet over Kansas at the time of the call. Chris Bashioum will lead off as your Maître d’





Peter F Brown

Independent Consultant

Transforming our Relationships with Information Technologies



P.O. Box 49719, Los Angeles, CA 90049, USA

Tel: +1.310.694.2278


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